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you have a multiframe page or if your users work with two copies of the same page or multiple pages of the same application at the same time. It also happens when you use session-enabled HTTP handlers to serve embedded resources such as images or cascading style sheet (CSS) files. By default, you are protected against concurrent accesses. However, declaring the exact use of the session state that a page is going to make (read/write, readonly, or no use) is an excellent form of optimization. You do this through the EnableSessionState attribute on the @Page directive.

The HttpSessionState class is defined in the System.Web.SessionState namespace. It is a generic collection class and implements the ICollection interface. The properties of the HttpSessionState class are listed in Table 17-5.

TABLE 17-5

In Internet Explorer, type the URL http://localhost/ReportServer / Custom%20Reporting/Product%20Profitability&rc:Toolbar=false to view the report without the toolbar, as shown here:

7. Click Next . The Select Related Tables page displays all of the tables that are related to the main table selected on the previous page . When the main table is a fact table, there may be many related dimension tables . In this exercise, you don t want to include any of the dimension table data in the degenerate dimension . 8. On the Select Related Tables page, clear all of the tables .

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Gets or sets the code page identifier for the current session. Returns a reference to this object. It s provided for ASP compatibility. Details the application s configuration for cookieless sessions. Declared to be of type HttpCookieMode. (I ll discuss this in more detail later.) Gets the number of items currently stored in the session state. Indicates whether the session ID is embedded in the URL or stored in an HTTP cookie. It s more specific than CookieMode. Indicates whether the session was created with the current request. Indicates whether the session is read-only. The session is read-only if the EnableSessionState attribute on the @Page directive is set to the keyword ReadOnly. Returns false. (See references to this later in the chapter.) Indexer property, provides read/write access to a session-state value. The value can be specified either by name or index. Gets a collection of the keys of all values stored in the session. Gets or sets the locale identifier (LCID) of the current session. Gets a value denoting the state client manager being used. Acceptable values are listed in Table 17-4. Gets a string with the ID used to identify the session. Gets a collection including all instances of all objects declared in global.asax using an <object> tag with the scope attribute set to Session. Note that you cannot add objects to this collection from within an ASP.NET application that is, programmatically. Returns a reference to this object. (See references to this property later in the chapter.) Gets or sets the minutes that the session module should wait between two successive requests before terminating the session.

The HttpSessionState class is a normal collection class because it implements the ICollection interface, but synchronization-wise it is a very special collection class. As mentioned, the synchronization mechanism is implemented in the SessionStateModule component, which guarantees that at most one thread will ever access the session state. However, because HttpSessionState implements the ICollection interface, it must provide an implementation for both IsSynchronized and SyncRoot. Note that IsSynchronized and SyncRoot are collectionspecific properties for synchronization and have nothing to do with the session synchroniza-

tion discussed previously. They refer to the ability of the collection class (HttpSessionState in this case) to work in a synchronized manner. Technically speaking, the HttpSessionState is not synchronized, but access to session state is.

Table 17-6 shows all the methods available in the HttpSessionState class. They mostly relate to typical operations on a collection. In this sense, the only exceptional method is Abandon, which causes the session to be canceled.

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